E.Blackwood Dr.Paul, E.Etter Richard, M.Garrels Dr.Robert, & Mckown Stephens Margaret. (1962). The world and its wonders.( Kỳ quan thế giới). Chicago: The Childs world.
Παραπομπή Chicago StyleE.Blackwood Dr.Paul, E.Etter Richard, M.Garrels Dr.Robert, και Mckown Stephens Margaret. The World and Its Wonders.( Kỳ Quan Thế Giới). Chicago: The Childs world, 1962.
Παραπομπή MLAE.Blackwood Dr.Paul, E.Etter Richard, M.Garrels Dr.Robert, και Mckown Stephens Margaret. The World and Its Wonders.( Kỳ Quan Thế Giới). Chicago: The Childs world, 1962.
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